Classifications

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  • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
  • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
  • C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D307/68—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
• • A—HUMAN NECESSITIES
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  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/335—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin
  • A61K31/337—Heterocyclic compounds having oxygen as the only ring hetero atom, e.g. fungichromin having four-membered rings, e.g. taxol
• • A—HUMAN NECESSITIES
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  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
  • A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
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  • A61K31/53—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with three nitrogens as the only ring hetero atoms, e.g. chlorazanil, melamine
• • A—HUMAN NECESSITIES
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  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/535—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines
  • A61K31/5375—1,4-Oxazines, e.g. morpholine
  • A61K31/5377—1,4-Oxazines, e.g. morpholine not condensed and containing further heterocyclic rings, e.g. timolol
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  • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
  • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
  • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
  • A61K47/56—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule
  • A61K47/58—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. poly[meth]acrylate, polyacrylamide, polystyrene, polyvinylpyrrolidone, polyvinylalcohol or polystyrene sulfonic acid resin
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
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  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C327/00—Thiocarboxylic acids
  • C07C327/38—Amides of thiocarboxylic acids
  • C07C327/56—Amides of thiocarboxylic acids having nitrogen atoms of thiocarboxamide groups further bound to another hetero atom
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  • C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
  • C07D209/04—Indoles; Hydrogenated indoles
  • C07D209/30—Indoles; Hydrogenated indoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to carbon atoms of the hetero ring
  • C07D209/42—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
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  • C07D209/00—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D209/02—Heterocyclic compounds containing five-membered rings, condensed with other rings, with one nitrogen atom as the only ring hetero atom condensed with one carbocyclic ring
  • C07D209/44—Iso-indoles; Hydrogenated iso-indoles
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  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
  • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
  • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D213/78—Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, e.g. ester or nitrile radicals
  • C07D213/83—Thioacids; Thioesters; Thioamides; Thioimides
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  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D261/00—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings
  • C07D261/02—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings
  • C07D261/06—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having two or more double bonds between ring members or between ring members and non-ring members
  • C07D261/10—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having two or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D261/18—Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen
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  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
  • C07D333/02—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings
  • C07D333/04—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom
  • C07D333/26—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom not condensed with other rings not substituted on the ring sulphur atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D333/38—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
• • C—CHEMISTRY; METALLURGY
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  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D333/00—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom
  • C07D333/50—Heterocyclic compounds containing five-membered rings having one sulfur atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
  • C07D333/52—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes
  • C07D333/62—Benzo[b]thiophenes; Hydrogenated benzo[b]thiophenes with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the hetero ring
  • C07D333/68—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
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  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2601/00—Systems containing only non-condensed rings
  • C07C2601/02—Systems containing only non-condensed rings with a three-membered ring
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  • C07C2601/00—Systems containing only non-condensed rings
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  • C07C2601/00—Systems containing only non-condensed rings
  • C07C2601/06—Systems containing only non-condensed rings with a five-membered ring
  • C07C2601/08—Systems containing only non-condensed rings with a five-membered ring the ring being saturated
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  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2601/00—Systems containing only non-condensed rings
  • C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
  • C07C2601/14—The ring being saturated

Definitions

• tumors are more responsive to treatment when anti- cancer drugs are administered in combination to the patient than when the same drugs are administered individually and sequentially.
• anti-cancer agents often act synergistically because the tumors cells are attacked simultaneously with agents having multiple modes of action. Thus, it is. often possible to achieve more rapid reductions in tumor size by administering these drugs in combination.
• Another advantage of combination chemotherapy is that tumors are more likely to be eradicated completely and are less likely to develop resistance to the anti-cancer drugs being used to treat the patient.
• anti-cancer agents generally have severe side effects, even when administered individually.
• the well known anti-cancer agent taxol causes neutroperia, neuropathy, mucositis, anemia, thrombocytopenia, bradycardia, diarrhea and nausea.
• the toxicity of anti-cancer agents is generally additive when the drugs are administered in combination.
• certain types of anti-cancer drugs are generally not combined.
• the combined toxic side-effects of those anti-cancer drugs that are administered simultaneously can place severe limitations on the quantities that can be used in combination. Often, it is not possible to use enough of the combination therapy to achieve the desired synergistic effects. Therefore, there is an urgent need for agents which can enhance the desirable tumor attacking properties of anti-cancer agents without further increasing their undesirable side-effects.
• Y is a covalent bond, a phenylene group or a substituted or unsubstituted straight chained hydrocarbyl group.
• Y is a covalent bond or - R ⁇ Rs)-.
• Ri is an aliphatic group, a substituted aliphatic group, a non-aromatic heterocyclic group, or a substituted non-aromatic heterocyclic group.
• R 2 -R are independently -H, an aliphatic group, a substituted aliphatic group, a non-aromatic heterocyclic group, a substituted non-aromatic heterocyclic group, an aryl group or a substituted aiyl group, or Rj and R 3 taken together with the carbon and nitrogen atoms to which they are bonded, and/or R 2 and R 4 taken together with the carbon and nitrogen atoms to which they are bonded, form a non-aromatic heterocyclic ring optionally fused to an aromatic ring.
• R 5 -R 6 are independently -H, an aliphatic group, a substituted aliphatic group, an aryl group or a substituted aryl group.
• R 7 and R 8 are each independently -H, an aliphatic or substituted aliphatic group, or R 7 is -H and R 8 is a substituted or unsubstituted aryl group, or, R and R 8> taken together, are a C2-C6 substituted or unsubstituted alkylene group.
• Rj and R 2 in the compound represented by Structural Formula (I) are not both C1-C5 alkyl (preferably not both methyl) when Y is -C(R 7 R 8 )- R 3 and R are both phenyl and R 5 -R 8 are all -H.
• Another embodiment of the present invention is a pharmaceutical composition
• a pharmaceutical composition comprising a pharmaceutically acceptable carrier or diluent and a compound represented by Structural Formula (I).
• the pharmaceutical composition comprises an effective concentration of the compound.
• Yet another embodiment of the present invention is a method of treating a subject with cancer.
• the method comprises administering to the subject an effective amount of taxol or a taxol analog and an effective amount of a compound represented by Structural Formula (I).
• the disclosed compounds increase the anti-cancer activity of taxol and taxol analogs. In addition, these compounds have minimal toxic side-effects. Consequently, it is possible to increase the effectiveness of taxol and analogs thereof when used in combination with the disclosed compounds, even when approaching the highest tolerated doses of taxol. Thus, it is expected that combination therapy with the compounds of the present invention will provide improved clinical outcomes for patients with cancers that are being treated with taxol. By co- administering the disclosed compounds with taxol, it is also possible to achieve the same therapeutic effectiveness previously achieved with higher doses of taxol, thereby reducing the side-effects and improving the quality of life for the patient. BRIEF DESCRIPTION OF THE DRAWINGS
• Figure 1 is a graph showing the average tumor volume in milliliters over time (in days) in nude mice treated with vehicle (•); Compound (1) (25 mg/kg) ( ⁇ ); Paclitaxel (15 mg/kg) ( ⁇ ); or Compound (1) (25 mg/kg) and Paclitaxel (15 mg/kg) (D).
• the tumors were generated from the human breast tumor cell line MDA-435.
• Figure 2 is a graph showing the percent weight change over time in nude mice treated with vehicle (•); Compound (1) (25 mg/kg) ( ⁇ ); Paclitaxel (15 mg/kg) ( ⁇ ); or Compound (1) (25 mg/kg) and Paclitaxel (15 mg/kg) (D).
• vehicle ⁇
• Compound (1) 25 mg/kg
• Paclitaxel 15 mg/kg
• the mice were being treated for tumors generated from the human breast tumor cell line MDA-435.
• Figure 3 is the structure of taxol (Paclitaxel)
• Figure 4 is the structure of taxotere (Docetaxol)
• Figures 5-25 are each the structure of a taxol analog.
• Figure 26 is the structure of a polymer comprising a taxol analog group pendent from the polymer backbone.
• the polymer is a terpolymer of the three monomer units shown.
• the present invention is directed to compounds represented by Structural Formula (I) and the use thereof as taxol enhancers in the treatment of cancer.
• Y is a covalent bond or a substituted or unsubstituted straight chained hydrocarbyl group.
• the remainder of the variables in Structural Formula (I) are as described above.
• Ri-R 6 in Structural Formula (II) are as described in Structural Formula (I).
• Ar is a substituted or unsubstituted arylene group.
• Ar is a nitrogen- containing heteroarylene group. Examples are shown below:
• Ring A is substituted or unsubstituted.
• Y in Structural Formula (I) is a covalent bond or a substituted or unsubstituted straight chained hydrocarbyl group.
• R 7 and Rg are as described for Structural Formula (I).
• Y is a covalent bond or -C(R 7 R 8 )-.
• Y in Structural Formula (I) is a covalent bond or -C(R R 8 )- and the compound of the present invention is represented by Structural Formula (III):
• R ⁇ -R 8 are as described for Structural Formula (I).
• Y' is a covalent bond or -C(R R 8 )- .
• R 7 and R 8 are both methyl;
• R and R 8 taken together, are propylene or butylene; or
• R is -H and
• R 8 is lower alkyl (preferably methyl), thienyl, phenyl or benzyl.
• at least one of R ⁇ -R 2 is a substituted aliphatic group, an unsubstituted aliphatic group, a substituted non-aromatic heterocyclic group or an unsubstituted non-aromatic heterocyclic group.
• R 5 -Rs are all -H.
• at least one of R ⁇ -R 2 is an unsubstituted cyclic aliphatic group, a substituted cyclic aliphatic group, a substituted straight chained or branched aliphatic group, a substituted non-aromatic hetereocyclic group, or an unsubstituted non-aromatic hetereocyclic group.
• R 3 and R 4 are preferably methyl.
• R 5 -R 8 in Structural Formula (III) are -H and the compound is represented by Structural Formula (TV):
• R 1 -R 4 in Structural Formula (IV) are as described in Structural Formula (I).
• Y" is a covalent bond or -CH 2 -.
• R 3 and R are both a substituted or unsubstituted aliphatic group, preferably both a substituted or unsubstituted lower alkyl group and more preferably both a methyl group or ethyl.
• Ri and R 2 are preferably both a substituted or unsubstituted aliphatic group (preferably a substituted or unsubstituted alkyl group and more preferably a C3-C8 substituted or unsubstituted cyclic aliphatic group such as a substituted or unsubstituted cyclopropyl group); or 2) Ri is preferably a substituted or unsubstituted aliphatic group (preferably a substituted or unsubstituted cyclic aliphatic group); and R 2 is preferably: i) a substituted or unsubstituted aryl group (e.g., a substituted or unsubstituted heteroaryl group or a substituted or unsubstituted phenyl group; or ii) an substituted or unsubstituted aliphatic group
• R 3 and R 4 are both a substituted or unsubstituted heteroaryl group.
• R and R 4 in Structural Formula (IV) are both a substituted or unsubstituted heteroaryl group, then: 1) Ri and R 2 are preferably both a substituted or unsubstituted aliphatic group (preferably a substituted or unsubstituted alkyl group); or 2) R] is preferably a substituted or unsubstituted aliphatic group (preferably a substituted or unsubstituted C3-C8 cyclic aliphatic group); and R 2 is preferably: i) a substituted or unsubstituted aryl group (e.g., a substituted or unsubstituted heteroaryl group or a substituted or unsubstituted phenyl group; or ii) an substituted or unsubstituted aliphatic group (preferably
• R and R 4 are both a substituted or unsubstituted phenyl group (e.g., a phenyl group substituted with at least one group other than an aliphatic group).
• Ri and R 2 are preferably both a substituted or unsubstituted aliphatic group (preferably a substituted or unsubstituted alkyl group and more preferably a C3-C8 substituted or unsubstituted cyclic aliphatic group such as a substituted or unsubstituted cyclopropyl group); or 2) Ri is preferably a substituted or unsubstituted aliphatic group (preferably a substituted or unsubstituted cyclic aliphatic group); and R 2 is preferably: i) a substituted or unsubstituted aryl group (e.g., a substituted or unsubstituted heteroaryl group or a substituted or unsubstituted phenyl group; or ii) an substituted or unsubstituted aliphatic group (
• Ri and R 2 are both a substituted or unsubstituted aliphatic group, preferably both a substituted or unsubstituted lower alkyl group, including a C3-C8 cycloalkyl group substituted with at least one lower alkyl group (e.g., methyl, ethyl, n-propyl, w-butyl, 7z-pentyl, cyclopropyl, 1-methylcyclopropyl, 2-methylcyclopropyl, cyclobutyl, cyclopentyl, or cyclohexyl).
• a substituted or unsubstituted aliphatic group preferably both a substituted or unsubstituted lower alkyl group, including a C3-C8 cycloalkyl group substituted with at least one lower alkyl group (e.g., methyl, ethyl, n-propyl, w-butyl, 7z-pentyl,
• R 3 and R ⁇ t are preferably both:l) a substituted or unsubstituted aryl group (e.g., a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted phenyl group, or a phenyl group with at least one substituent other than an aliphatic group); or 2) a substituted or unsubstituted aliphatic group (preferably a substituted or unsubstituted alkyl group).
• aryl group e.g., a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted phenyl group, or a phenyl group with at least one substituent other than an aliphatic group
• a substituted or unsubstituted aliphatic group preferably a substituted or unsubstituted alkyl group.
• Ri and R 2 are both a substituted or unsubstituted cyclic aliphatic group, preferably both a substituted or unsubstituted cyclopropyl alkyl group.
• Ri is a substituted or unsubstituted aliphatic group and R 2 is a substituted or insubstituted aryl group.
• Ri and R 2 are both methyl, and R and . t are both /?-CF 3 -phenyl; Rj and R 2 are both methyl, and R 3 and R are both o-CH 3 -phenyl; Ri and R 2 are both -CH 2 ) 3 COOH;and R and R-j are both phenyl; R] and R 2 are both represented by the
• R 3 and P are both phenyl; Ri and R 2 are both 7/-butyl, and R 3 and Rj are both phenyl; Ri and R are both /z-pentyl, R and R 4 are both phenyl; Rj and R 2 are both methyl, and R 3 and R 4 are both 2-pyridyl; Ri and R 2 are both cyclohexyl, and R 3 and are both phenyl; Ri and R 2 are both methyl, and R 3 and R 4 are both 2-ethylphenyl; Rj and R 2 are both methyl, and R and R 4 are both 2,6-dichlorophenyl; R 1 -R 4 are all methyl; Ri and R 2 are both methyl, and R and R 4 are both t-butyl; R) and R 2 are both ethyl, and R 3 and R4 are both methyl; Ri and R 2 are both t-butyl, and R 3 and R4 are both methyl;
• Y in Structural Formula (I) is -C(R 7 R)- and R 5 and R 6 are both -H.
• the compound of the present invention is represented by Structural Formula (V):
• R 1 -R 4 , R and R 8 are as described for Structural Formula (I) and Y' is a covalent bond or -CR 7 R 8 -.
• R and R 8 are the same or different.
• R 7 and R 8 are both methyl;
• R 7 and R 8j taken together, are propylene or butylene; or
• R 7 is -H and R 8 is lower alkyl (preferably methyl), thienyl, phenyl or benzyl.
• R ⁇ and R 2 are both a lower alkyl group or a substituted lower alkyl group and R 3 and R 4 are both an aryl group or a substituted aryl group.
• Ri and R 2 are both substituted or unsubstituted aliphatic groups and R and R4 are both a lower alkyl group or a substituted lower alkyl group; preferably, Ri and R 2 are both substituted or unsubstituted alkyl groups (more preferably substituted or unsubstituted cyclic alkyl groups), R 3 and R 4 .
• Rj and R 2 are both C3-C8 cyclic alkyl or substituted C3-C8 cyclic alkyl and R 3 and R 4 are both methyl, ethyl, phenyl, or thienyl (preferably, R and R 8 are: 1) both methyl; 2)taken together, propylene or butylenes; or 3) R 7 is -H and R 8 is lower alkyl, thienyl, phenyl or benzyl).
• Ri and R 2 are both a lower alkyl group or a substituted lower alkyl group and R and R4 are both methyl, ethyl or phenyl.
• Ri and 2 are both cyclopropyl; R 3 and R4 are both methyl; R 7 and R 8 are both -H; Ri and R 2 are both cyclopropyl; R and R 4 are both ethyl; R 7 and R 8 are both -H; Ri and R 2 are both cyclopropyl; R 3 and * are both methyl; R 7 is methyl; R 8 is -H; i and R2 are both 1-methylcyclopropyl; R 3 and R 4 are both methyl; Y' is bond; R ⁇ and R 2 are both 1-methylcyclopropyl; R 3 and 4 are both methyl; R 7 and R 8 are both -H; Ri and R 2 are both 1-methylcyclopropyl; R 3 and R 4 are both methyl; R 7 is methyl and R 8 is -H; Ri and R 2 are both 1-methylcyclopropyl; R 3 and R 4 are both methyl; R 7 is methyl and R 8 is -H; Ri and R 2 are both 1-methylcycl
• Y in Structural Formula (I) is a covalent bond or -CH 2 -.
• the compound of the present invention is represented by Structural Formula (VI):
• Ri-R f i in Structural Formula (VI) are as described for Structural Formula (I).
• R 5 and R ⁇ are the same or different.
• Y" is a covalent bond or -CH 2 -.
• R 5 and R 6 are both a lower alkyl group (preferably methyl) or a phenyl group.
• Ri and R 2 are preferably both lower alkyl or substituted lower alkyl and R and 4 are preferably both phenyl or substituted phenyl.
• R 5 and R 6 are both a lower alkyl group or a phenyl group
• Ri and R 2 are both a lower alkyl group or a substituted lower alkyl group
• R 3 are both lower alkyl or substituted lower alkyl.
• Ri and R 2 are the same (e.g., Ri and R? are both the same substituted or unsubstituted aliphatic group) or different (e.g., Ri is asubstituted or unsubstituted aliphatic group and R 2 is a substituted or unsubstituted aryl group); and/or R 3 and Rj are the same or different.
• R ⁇ and R 2 are the same, and R 3 and R 4 are the same.
• a “straight chained hydrocarbyl group” is an alkylene group, i.e., -(CH 2 ) X -, with one or more (preferably one) methylene groups optionally replaced with a linkage group, x is a positive integer (e.g., between 1 and about 10), preferably between 1 and about 6 and more preferably 1 or 2.
• a “linkage group” refers to a functional group which replaces a methylene in a straight chained hydrocarbyl.
• linkage groups examples include a ketone (-C(O)-), alkene, alkyne, phenylene, ether (-O-), thioether (-S-), or amine [-N(R )]-, wherein R a is defined below.
• a preferred linkage group is -C(R 7 R 8 )-, wherein R 7 and R 8 are defined above.
• Suitable substitutents for an alkylene group and a hydrocarbaryl group are those which do not substantially interfere with the reactions described herein.
• R 7 and R 8 are preferred substituents for an alkylene or hydrocarbyl group.
• An aliphatic group is a straight chained, branched or cyclic non-aromatic hydrocarbon which is completely saturated or which contains one or more units of unsaturation.
• a straight chained or branched aliphatic group has from 1 to about 20 carbon atoms, preferably from 1 to about 10, and a cyclic aliphatic group has from 3 to about 10 carbon atoms, preferably from 3 to about 8.
• An aliphatic group is preferably a straight chained or branched alkyl group, e.g, methyl, ethyl, n- propyl, wo-propyl, 77-butyl, sec-butyl, tert-butyl, pentyl, hexyl, pentyl or octyl, or a cycloalkyl group with 3 to about 8 carbon atoms, e.g, cyclopropyl, clobutyl, cyclopentyl, cyclohexyl, or cyclooctyl.
• a C1-C20 straight chained or branched alkyl group or a C3-C8 cyclic alkyl group is also referred to as a "lower alkyl" group.
• Aromatic groups include carbocyclic aromatic groups such as phenyl, naphthyl, and anthracyl, and heteroaryl groups such as imidazolyl, thienyl, furanyl, pyridyl, pyrimidy, pyranyl, pyrazolyl, pyrroyl, pyrazinyl, thiazole, oxazolyl, and tetrazole.
• Aromatic groups also include fused polycyclic aromatic ring systems in which a carbocyclic aromatic ring or heteroaryl ring is fused to one or more other heteroaryl rings.
• Examples include benzothienyl, benzofuranyl, indolyl, quinolinyl, benzothiazole, benzooxazole, benzimidazole, quinolinyl, isoquinolinyl and isoindolyl.
• arylene refers to an aryl group which is connected to the remainder of the molecule by two other bonds.
• 1,4-phenylene group is shown below:
• Non-aromatic heterocyclic rings are non-aromatic carbocyclic rings which include one or more heteroatoms such as nitrogen, oxygen or sulfur in the ring.
• the ring can be five, six, seven or eight-membered. Examples include tetrahydrofuranyl, tetrahyrothiophenyl, morpholino, thio orpholino, pyrrolidinyl, piperazinyl, piperidinyl, and thiazolidinyl.
• lower alkoxy means to -O-(lower alkyl), -C(O)-(lower alkyl), -CH 2 -O- (lower alkyl) and -CH 2 -S-(lower alkyl), respectively.
• substituted lower alkoxy and “substituted lower acyl” mean -O-(substituted lower alkyl) and -C(O)- (substituted lower alkyl), respectively.
• Suitable substituents on an aliphatic group, non-aromatic heterocyclic group, benzylic or aryl group are those which do not substantially interfere with the ability of the disclosed compounds to enhance the anti-cancer activity of taxol and analogs thereof.
• a substituent substantially interferes with the ability of a disclosed compound to enhance anti-cancer activity when the enhancement is reduced by more than about 50% in a compound with the substituent compared with a compound without the substituent.
• R a -R d are each independently an aliphatic, substituted aliphatic, benzyl, substituted benzyl, aromatic or substituted aromatic group, preferably an alkyl, benzylic or aryl group.
• -NR a R d taken together, can also form a. substituted or unsubstituted non-aromatic heterocyclic group.
• a non-aromatic heterocyclic group, benzylic group or aryl group can also have an aliphatic or substituted aliphatic group as a substituent.
• a substituted aliphatic group can also have a non-aromatic heterocyclic ring, a substituted a non-aromatic heterocyclic ring, benzyl, substituted benzyl, aryl or substituted aryl group as a substituent.
• a substituted aliphatic, non-aromatic heterocyclic group, substituted aryl, or substituted benzyl group can have more than one substituent.
• compositions described herein are pharmaceutically acceptable salts of the compounds described herein.
• the compound of the present invention which possess a sufficiently acidic, a sufficiently basic, or both functional groups, and accordingly can react with any of a number of inorganic bases, and inorganic and organic acids, to form a salt.
• Acids commonly employed to form acid addition salts are inorganic acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, phosphoric acid, and the like, and organic acids such asp- toluenesulfonic acid, methanesulfonic acid, oxalic acid,/>-bromophenyl-sulfonic acid, carbonic acid, succinic acid, citric acid, benzoic acid, acetic acid, and the like.
• inorganic acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, phosphoric acid, and the like
• organic acids such asp- toluenesulfonic acid, methanesulfonic acid, oxalic acid,/>-bromophenyl-sulfonic acid, carbonic acid, succinic acid, citric acid, benzoic acid, acetic acid, and the like.
• salts include the sulfate, pyrosulfate, bisulfate, sulfite, bisulfite, phosphate, monohydrogenphosphate, dihydrogenphosphate, metaphosphate, pyrophosphate, chloride, bromide, iodide, acetate, propionate, decanoate, caprylate, acrylate, formate, isobutyrate, caproate, heptanoate, propiolate, oxalate, malonate, succinate, suberate, sebacate, fumarate, maleate, butyne-l,4-dioate, hexyne-1 ,6- dioate, benzoate, chlorobenzoate, methylbenzoate, dinitrobenzoate, hydroxybenzoate, methoxybenzoate, phthalate, sulfonate, xylenesulfonate, phenylacetate, phenylpropionate, phenylbuty
• Base addition salts include those derived from inorganic bases, such as ammonium or alkali or alkaline earth metal hydroxides, carbonates, bicarbonates, and the like.
• bases useful in preparing the salts of this invention thus include sodium hydroxide, potassium hydroxide, ammonium hydroxide, potassium carbonate, and the like.
• Taxol also referred to as "Paclitaxel” is a well-known anti-cancer drug which acts by inhibiting microtubule formation.
• Many analogs of taxol are known, including taxotere, the structure of which is shown in Figure 4. Taxotere is also referred to as ""Docetaxol”.
• the structure of other taxol analogs are shown in Figures 5-25. These compounds have the basic taxane skeleton as a common structure feature and have also been shown to have the ability to arrest cells in the G2-M phases due to stabilized microtubules. Thus, it is apparent from Figures 5-25 that a wide variety of substituents can decorate the taxane skeleton without adversely affecting biological activity.
• taxane analog is defined herein to mean a compound which has the basic taxol skeleton and which promotes disassembly of microtubules.
• Rio is a lower alkyl group, a substituted lower alkyl group, a phenyl group, a substituted phenyl group, -SR 19 , -NHR 19 or -OR 19 .
• Ri 1 is a lower alkyl group, a substituted lower alkyl group, an aryl group or a substituted aryl group.
• R12 is -H, -OH, lower alkyl, substituted lower alkyl, lower alkoxy, substituted lower alkoxy, -O-C(O)-(lower alkyl), -O-C(O)-(substiruted lower alkyl), -0-CH 2 -O-(lower alkyl) -S-CH 2 -0-(lower alkyl).
• R ⁇ 3 is -H, -CH 3 , or, taken together with R ] , -CH 2 -.
• R ⁇ is -H, -OH, lower alkoxy, -0-C(0)-(lower alkyl), substituted lower alkoxy, -O-C(O)-(substituted lower alkyl), -0-CH 2 -0-P(0)(OH) 2 , -O-CH 2 -0-(lower alkyl), -O-CH 2 -S-(lower alkyl) or, taken together with R 2 o, a double bond.
• R 15 H, lower acyl, lower alkyl, substituted lower alkyl, alkoxymethyl, alkthiomethyl, -OC(O)-O(lower alkyl), -OC(O)-O(substituted lower alkyl), -OC(O)-NH(lower alkyl) or -OC(0)-NH(substituted lower alkyl).
• Ri 6 is phenyl or substituted phenyl.
• R ⁇ 7 is -H, lower acyl, substituted lower acyl, lower alkyl, substituted, lower alkyl, (lower alkoxy)methyl or (lower alkyl)thiomethyl.
• Ri 9 is a lower alkyl group, a substituted lower alkyl group, a phenyl group, a substituted phenyl group.
• R20 is -H or a halogen.
• R 21 is -H, lower alkyl, substituted lower alkyl, lower acyl or substituted lower acyl.
• R ⁇ is phenyl, (CH 3 ) 2 CHCH 2 -, -2-furanyl, cyclopropyl or/xara-toluyl;
• R12 is -H, - OH, CH 3 CO- or -(CH 2 ) 2 -N-morpholino;
• R ]3 is methyl, or, R ⁇ 3 and R ) , taken together, are -CH 2 -;
• R ⁇ 4 is -H, -CH 2 SCH 3 or -CH 2 -0-P(O)(OH) 2 ;
• R 15 is CH 3 CO-;
• Ri 6 is phenyl; R ⁇ 7 -H, or, R ⁇ and R i8 , taken together, are -O-CO-O-;
• Ris is -H; R 20 is -H or -F; and R 2 ⁇ is -H, -C(O)-CHBr-(CH 2 ) ⁇ 3 -CH 3 or -C(O)-(CH 2 ) ]4 -CH 3 ; -C(O)-CH 2 -CH(OH)-COOH, -C(O)-CH 2 -O-C(O)- CH 2 CH( ⁇ H 2 )-CO ⁇ H 2 , -C(O)-CH 2 -O-CH 2 CH 2 OCH 3 or -C(O)-O-C(O)-CH 2 CH 3 .
• a taxol analog can also be bonded to or be pendent from a pharmaceutically acceptable polymer, such as a polyacrylamide.
• a pharmaceutically acceptable polymer such as a polyacrylamide.
• a polymer of this type is shown in Figure 26.
• the disclosed compounds are enhancers of the anti-cancer activity of taxol and taxol analogs.
• a compound enhances the anti-cancer activity of taxol or a taxol analog when the activity of taxol or the taxol analog is greater when administered in combination with the compound than when administered alone. The degree of the increase in activity depends upon the amount of compound administered.
• the compounds of the present invention can therefore be used in combination with taxol or taxol analogs to treat subjects with cancers. Examples include colon cancer, pancreatic cancer, melanoma, renal cancer, sarcoma, breast cancer, ovarian cancer, lung cancer, stomach cancer, bladder cancer and cervical cancer.
• a "subject” is a mammal, preferably a human, but can also be an animal in need of veterinary treatment, e.g., companion animals (e.g., dogs, cats, and the like), farm animals (e.g., cows, sheep, pigs, horses, and the like) and laboratory animals (e.g., rats, mice, guinea pigs, and the like).
• companion animals e.g., dogs, cats, and the like
• farm animals e.g., cows, sheep, pigs, horses, and the like
• laboratory animals e.g., rats, mice, guinea pigs, and the like.
• an effective amount of a compound of the present invention and an effective amount of taxol or analog of taxol are administered to the subject.
• an "effective amount” is a quantity in which anti-cancer effects are normally achieved.
• an "effective amount” is the quantity in which a greater anti-cancer effect is achieved when the compound is co-administered with taxol or a taxol analog compared with when taxol or the taxol analog is administered alone.
• the compound and taxol (or taxol analog) can be co-administered to the subject as part of the same pharmaceutical composition or, alternatively, as separate pharmaceutical compositions.
• the compound or the present invention and taxol (or taxol analog) can be administered simultaneously or at different times, provided that the enhancing effect of the compound is retained.
• the amount of compound and taxol (or taxol analog) administered to the subject will depend on the type and severity of the disease or condition and on the characteristics of the subject, such as general health, age, sex, body weight and tolerance to drugs. It will also depend on the degree, severity and type of cancer. The skilled artisan will be able to dete ⁇ nine appropriate dosages depending on these and other factors.
• Effective dosages for taxol and taxol analog are well known and typically range from between about 1 mg/mm 2 per day and about 1000 mg/mm 2 per day, preferably between about 10 mg/mm" per day and about 500 mg/mm per day.
• Effective amounts of a compound of the present invention typically range between about 1 mg/mm 2 per day and about 10 grams/mm 2 per day, and preferably between
• the disclosed compounds are administered by any suitable route, including, for example, orally in capsules, suspensions or tablets or by parenteral administration.
• Parenteral administration can include, for example, systemic administration, such as by intramuscular, intravenous, subcutaneous, or intraperitoneal injection.
• the compounds can also be administered orally (e.g., dietary), topically, by inhalation (e.g., intrabronchial, intranasal, oral inhalation or intranasal drops), or rectally, depending on the type of cancer to be treated.
• Oral or parenteral administration are preferred modes of administration.
• Suitable routes of administration of taxol and taxol analogs are well known in the art and include by parenteral administration, as described above for the compounds of the present invention. Suitable routes of administration for taxol and analogs thereof are well known and include inter alia parenteral and oral administration.
• the disclosed compounds can be administered to the subject in conjunction with an acceptable pharmaceutical carrier as part of a pharmaceutical composition for treatment of cancer.
• Formulation of the compound to be administered will vary according to the route of administration selected (e.g., solution, emulsion, capsule).
• Suitable pharmaceutical carriers may contain inert ingredients which do not interact with the compound. Standard pharmaceutical formulation techniques can be employed, such as those described in Remington's Pharmaceutical Sciences, Mack Publishing Company, Easton, PA.
• Suitable pharmaceutical carriers for parenteral administration include, for example, sterile water, physiological saline, bacteriostatic saline (saline containing about 0.9% mg/ml benzyl alcohol), phosphate-buffered saline, Hank's solution, Ringer's-lactate and the like.
• compositions such as in a coating of hard gelatin or cyclodextrasn
• Suitable formulations for taxol and taxol analogs are well known in the art.
• the disclosed compounds can be prepared according to methods described in Examples 1-12 and also according to methods described in the co-pending US Provisional Application entitled SYNTHESIS OF TAXOL ENHANCERS, U.S. Provisional Application No. 60/304,318, filed July 10, 2001. The entire teachings of this application are incorporated herein byreference.
• Phenyl hydrazine (5.4g, 50 mmol) was dissolved in dry dichloromethane (50 mL) in a 250 mL round bottom flask. Di-tert-butyl dicarbonate (10.9 g, 50 mmol) was then added with stirring at 0 °C. The resultant solution was then stirred under reflux for 3 h. Removal of the volatile components under reduced pressure afforded a colorless solid, which was washed with hexane and dried in vacuo. 10 g (yield 96%) of the product was obtained as a colorless solid, which can be used in the next step without further purification. 2.5 g (12 mmol) of this material was dissolved in dry pyridine (5 mL).
• N-phenyl-N-cyclohexyl-N'-tert-butoxycarbonylhydrazide 1.1 g, 3.46 mmol
• dichloromethane 6 mL
• trifluoroacetic acid 6 mL
• the resultant solution was stirred at 0 °C for half an hour.
• Volatile components were then removed under reduced pressure to afford a syrup, which was turned into a solid upon standing; this material was briefly mixed with cold 2 N NaOH (5 mL) for a few minutes at 0 °C.
• Cyclopropyl bromide (4.8g, 40 mmol) was added into 50 ml anhydrous THF solution containing magnesium powder (l.lg, 45 mmol), stirred for 30 min, and refluxed for another 30 min. After it was cooled, the clear reaction solution was added into carbon disulfide (4 ml, 67 mmol) at 0 °C, and stirred for 30 min at rt. The resulting mixture was then added into methylhydrazine (8 ml, 150mmol) at 0 °C, and stirred for another 2 hours. To this solution was added water (40 ml) and extracted with EtOAc (60 ml x 3).
• Example 6 The following compounds shown below were prepared by the procedures described above. Analytical data is provided for these compounds.
• Compound (1) Enhances the Anti-Cancer Activity of Paclitaxel in vivo (Human xenografl model: Human Breast Carcinoma MDA-435 in nude mice)
• Tumor cells were implanted by injection of a tumor cell suspension subcutaneously in the flank of a mouse. Treatment of the tumor with an experimental compound and Paclitaxel began after the tumor had been established (volume was about 150 mm 3 ). Animal then begun a multiple injection schedule where the compound and Paclitaxel were given by IV route of administration. Tumors were measured two times a week. During the course of this assay, animals were monitored daily for signs of toxicity including body weight loss.
• MDA-435 Human Breast Carcinoma
• Anti-Tumor Study A supplemented media was prepared from 50% DMEM Dulbecco Modified Eagle Medium (High Glucose), 50% RPMI 1640, 10% FBS/Fetal Bovine Serum (Hybridoma Tested; Sterile Filtered), 1% L-Glutamine, 1% Penicillin-Streptomycin, 1% MEM Sodium Pymvate and 1% MEM Non-Essential Amino Acids.
• FBS was obtained from Sigma Chemical Co. and other ingredients were obtained from Invitrogen Life Technologies, USA).
• the supplemental media was warmed to 37° C and 50 ml of media was added to a 175 cm " tissue culture flask.
• the cells used in the assay were MDA-435 Human Breast Carcinoma from the American Type Culture Collection. 1 vial of MDA-435 cells from the liquid nitrogen frozen cell stock was removed. The frozen vial of cells was immediately placed into a 37° C water bath and gently swirled until thawed. The freeze-vial was wiped with 70% ethanol and cells were immediately pipetted into the 175 cm 2 tissue culture flask containing supplemented media. The cells were incubated overnight and the media was removed and replaced with fresh supplemented media the next day. The flask was incubated until flask became about 90% confluent. This took anywhere from 5-7 days.
• the flask was washed with 10 ml of sterile room temperature phosphate buffered saline (PBS).
• the cells were trypsinized by adding 5 ml of warmed Trypsin-EDTA (Invitrogen) to the flask of cells. The cells were then incubated for 2-3 minutes at 37° C until cells begun to detach from the surface of the flask. An equal volume of supplemented media (5 ml) was added to the flask. All the cells were collected into 50 ml tube, and centrifuged at 1000 RPM for 5 minutes at 20° C. The supernatant was aspirated and the cell pellet was resuspended in 10 ml of supplemented media and the cells were counted.
• PBS sterile room temperature phosphate buffered saline
• mice (CD-I nu/nu) were obtained from Charles River Laboratories: nomenclature: Crl:CD-l-nuBR, Age: 6-8 weeks. The mice were allowed to acclimate for 1 week prior to their being used in an experimental procedure.
• MDA-435 tumor cell suspension took place into the corpus adiposum of the female CD-I nu/nu mouse. This fat body is located in the ventral abdominal viscera of the mouse. Tumor cells were implanted subcutaneously into the fat body located in the right quadrant of the abdomen at the juncture of the os coxae (pelvic bone) and the os femoris (femur). 5 million MDA-435 cells in 0.1 ml of sterile PBS were injected using 27 G (1/2 inch) needle. MDA-435 tumors developed 2-3 weeks after implantation.
• Compound stock solutions were prepared by dissolving the compound in a 50:50 mixture of EtOH and Cremophor EL (Polyoxyl 35 Castor Oil, BASF, Germany). This stock solution in 50%EtOH / 50%CrEL was sonicated in an ultrasonic water bath until all the powder dissolved.
• Dosing Solution for Compound Administration The compound stock solution was diluted 1:10 with D5W (5% Dextrose in Water, Abbott Laboratories, USA). : 1) 2.0 ml of 2.5 mg/ml dosing solution of Compound (1) was prepared by diluting 0.2 ml of a 25 mg/ml Compound Stock solution with 1.8 ml of 100% D5W; and 2) a dosing solution comprising of 1.5 mg/ml of Paclitaxel (obtained from Sigma Chemical Co.) and 2.5 mg/ml of Compound (1) was obtained by mixing 0.2 ml of a 50%EtOH/ 50% CrEL stock solution containing 25 mg/ml of Compound (1) and 15 mg/ml of Paclitaxel with 1.8 ml of a 100% D5W solution. The final formulation for the dosing solution was 5% EtOH, 5% CrEL, 4.5 % Dextrose, and 85.5% water.
• MDA-435 Human breast carcinoma
• Figure 1 shows the effects of Compound (1) on enhancing anti-tumor activity of Paclitaxel (Taxol).
• Compound (1) significantly enlianced anti-tumor activity of Paclitaxel on human breast tumor MDA-435 in nude mice.
• Figure 2 shows the effects of Compound (1) and Paclitaxel on the body weight of nude mice bearing MDA-435 human breast tumor.
• Compound (1) significantly enlianced anti-tumor activity of Paclitaxel without increasing toxicity.

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